【摘要】 利用小浪底库区及周边地区具有代表性的12个气象站蓄水前后共20 a逐日雷暴资料,采用数理统计方法对各站雷暴日数、初日、终日及其空间分布特征等进行统计,结果表明:小浪底水库蓄水后,因水域面积增大,对小浪底库区及周边雷暴气候特征等有较大影响,库区和周边东部年雷暴日数和初终间日数呈增加趋势,周边南部呈减少趋势;雷暴日数秋季增加,夏季减少;库区和周边雷暴初日均呈明显的提前趋势,终日多呈推迟趋势。更多还原

【Abstract】 By using the 20 years’ daily thunderstorm data that are from the 12 representative stations of Xiaolangdi reservoir and it’s surrounding areas before and after impounding,the number of thunderstorm days,the initial day,the ending day and its characteristics of space distribution are gathered with the mathematical statistical methods.It is found that after Xiaolangdi reservoir impounding,the characteristics of the thunderstorm climate have been influenced by the increasing of the waters area.The annual number of thunderstorm days and the days between the initial and ending days of thunderstorm of the reservoir and the eastern part of its surrounding areas have an increasing trend;the southern part of the surrounding areas have a decreasing trend;the number of thunderstorm days are increased in autumn,decreased in summer;the initial days of the thunderstorm of Xiaolangdi reservoir and the surrounding areas have the ahead trend,and the ending days have the delay trend.更多还原